I found this article on somatropin.cn

Is there a difference between big pharma and Chinese generics? Other then the 90/10 price ratio, both are identical! Western Big Pharma use the same exact production procedure (recombinant DNA technology) and equipment as Chinese labs.
Chinese laws regarding GMP and safety of medicine related products are stricter than those in the west.
The identification, purification and later synthesis of growth hormone was first accomplished by a Chinese pioneer Choh Hao Li. Nowadays almost everything used in the west is made in China(our Asia at least) both the high and low quality products.
Human growth hormone(somatropin) is a large and fragile 191 amino acid sequence molecule with a molecular weight of approximately 22,000 Daltons. There is no room for differences. The substance is either somatropin or it is not. If the molecule gets distorted even a little, it will no longer bind to human growth receptors.
The reason Chinese goods are often seen as inferior is the car availability of cheaper copies of everything(clothes, electronics,etc.) Which visually appear the same as a original. But are composed of cheaper, inferior material and are thus lower quality and less durable. With production of somatropin this is not possible.The necessary equipment to even create it, comes at a multi million dollar price tag. So steroid "bathtub"labs are not capable of making it.
The only somatropin manufacturing method which is still in used today (both in the west and Asia) is the recombinant DNA technology where E coli bacteria are genetically modified to secrete human growth hormone. Which is then isolated and can either be lyophilized (freeze dried) our stored in the liquid form.
While somatropin is in the liquid form, it is very sensitive to temperature and shaking. If not refrigerated and handled with care the molecule are easily destroyed. While in freeze dried state, somatropin is not sensitive to shaking. This is why it is shipped in this form.